Differential pressure gauge



J. W. GAMBLE DIFFBRHNiIIAL PRESSURE GAUGE Fiied Fe 1921 2 Sheets-Sheet l INVENTOR. M g QM 2 BY Iowa 10-. km; 2 z

/ ATTORNEY, y rl Jan. 19 1926.

' J. w. GAMBLE DIFFERENTIAL PRESSURE GAUGE 1921 2 Sheets-Sheet 2 Filed Feb. 2,

Patented Jan. 19, 1926.

UNITED STATES PATENT OFFICE.

JOSEPH W. GAMBLE, DECEASED, LATE OF PHILADELPHIA, PENNSYLVANIA; IBY MARTHA GAMBLE, EXECUTRIX, OE PHILADELPHIA, PENNSYLVANIA, ASSIGNOB TO COCHRANE CORPORATION, OF PHILADELPHIA, PENNSYLVANIA, A CORPORA- TION OF PENNSYLVANIA.

-DIFFERENTIAL PRESSURE GAUGE.

Application filed February 2, 1921. Serial 1T0. 441,908.

To all whom it may concern:

Be it known that JOSEPH W. GAMBLE, deceased, late a citizen of the United States of America, residing in the city and county of Philadelphia, in the State of Pennsylvania, invented certain new and useful Improvements in Differential Pressure Gauges, of which the following is a true and exact description, reference being had to the accompanying drawings, which form a part thereof.

My invention relates to differential pressure gauges of the pivoted U tube type and has for its object to provide improved means for connecting the tubes of the U to the sources of pressure.

My invention consists, broadly speaking, in employing as a means for connecting the U tube structure to the sources of pressure, two torsional tubes preferably of thin metal connected to the structure in close proximity to its line of pivotal support and extending parallel to said-line'and to each other for a distance sufficient to insure that the moveferred details of constructive embodiment will be best understood as described in connection with the drawing, in which- Figure lis a front elevation of a flow meter embodying my invention.

Figure 2 a plan view.

Fi ure 3 a sectional view of the head to whic the torsion tubes are secured.

of the head a disc-like extension A at the end of the tube and a bracket A extendin out from the disc and supporting a plate having a V slot B in its top edge to'serve as a sup port for the knife edge pivot of the frame. C is the frame of the U tube auge having laterally extending arms'with eads C, C", at their ends. D is a knife edge pivot secured to the center of the frame C. E and E are the tubes of the U gauge secured to the heads 0 and G. The tube E is shorter than tube E and has secured to its lower end a base E with a. pasage E formed in it. F is a tube connecting asage E with the bottom of tube E. G, igs. 2, 3 and 4, is a head or block firmly secured to the frame 0 in such a way that it extends laterally over and lies in line with the knife edge D. The head G as shown, is formed with passages through it consisting of two perforations I and I F ilg. 3 lying in close proximity to the line of t e knife edge pivot and two laterally extending perforations H and H. J and J are the torsion tubes through c which the gauge is connected to the sources of pressure, not shown. These tubes are, as shown, forced into the perforations I and I and have their ends closed by plugs K, K, and they connect with perforations H and H through holes as indicated at J J L,

L, are tubes leading from perforations H and H to openings through heads C and G? into the tubes E, E. M, Fig. 4, is a disc secured to A which may serve as an element of an indicator. N is an adjusting weight screwing on a rod C attached to the frame O. O is a weight attached to arm C of frame C. 0 Fig. 4 is an indicator arm or pointer attached to frame C. p

P, Figs. 2, 4 and 8, is a clampsecured at the end of the tubular passage A having arms P P forming the split ring P in which fits the disc Q having spaced perforations in' which'the torsion tubes J, J pass and are held 'as shown. P is a screw by means of which the split ring is clamped on the disc Q.

In the modification shown in Figs. 5 and 7 the head G is formed with a perforation I in line with the edge of the knife edge pivot and a concentric smaller perforation I extending from the bottomof the hole I. The torsion tubes 9' and j are here concen- .frame C and torsion tubes indicated at jj and jj are secured to the heads in the line of the knife edge and connect with tubes L L through lateral perforations H, H.

The operation of my improved gauge is, of

course, obvious. The U tube structure, as the mercury in its tubes shifts from side to side to compensate for differences in pressure transmitted through the torsion tubes, turns on its knife edge pivot and the torsion tubes are twisted to permit of the turning movement but as the tubes lie parallel and in close proximity to the line of pivotal support and are within the limits of the turning movement, perfectly elastic, the twistin of the tubes requires but little power and can be readily compensated for.

My construction avoids the use of any packing boxes and can be readily and accurately made and put together.

It is preferable that the torsion tubes should be kept in alignment and gripped in position at a proper distance from their at-' tachment to the head G and for this purpose I secure the tubes in the disc Q as shown and secure the disc in proper position in the clamp P.

Having now described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. A differential pressure gauge having in combination a pivoted U tube and means for connecting the tops of the U tube with the sources of pressure comprising two parallel torsional tubes made of thin elastic metal firmly connected at one end to the U tube structure in close proximity to its point of pivotal suspension extending for a considerable distance at right angles to its plane of oscillation and rigidly anchored at their other ends.

2. A differential pressure gauge comprising high and low pressure tubes connected at their lower ends, and a pivoted frame for supporting said tubes in combination with one or more heads rigidly connected to the frame and extending laterally over and around its ,point of pivotal suspension, said head or heads having passages formed in them, as described, straight torsional tubes made of thin elastic metal for connecting the gauge to the sources of differential pressure firmly connected to the head or heads in close proximity to the horizontal line passin through the point of pivotal suspension 0 the gauge frame and extending for a considerable distance parallel to said line and conduits connecting the passages in the head or heads to the tops of the tubes.

3. A differential pressure gauge comprising high and low pressure tubes connected attheir lower ends, a frame in which said tubes are secured. a knife edge pivot secured to said frame and a supporting bracket having a laterally extending protected passage formed in it in line with the point of suspension of the frame, in combination with a head rigidly connected to the frame for the tubes and extending over and around its line of pivotal suspension on the bracket, said head being formed with passages, as described, a pair of straight torsional tubes made of thin elastic metal for connecting the gauge to the sources of differential pressure firmly connected to the head in close proximity to the line of pivotal support of the frame and extending parallel to said line for a considerable distance through the protected passage of the bracket and conduits connecting the passages in the head to the tops of the tubes.

MARTHA GAMBLE, Eazecutrim of J osep/z W. Gamble, deceased. 

